He plays basketball so well! Who taught _______?—He learnt it by _______.

How about your journey to Canada? — Everything was wonderful except that our car________.

There is still a copy of the book in the library. Will you go and borrow ?—No, I’d rather buy in the bookstore.

I don’t know if he tomorrow. But if he, I’ll tell you.

The terrorists（恐怖分子）in Xinjiang ______ last month.